Enum aws_sdk_connect::types::ChatEventType
source · #[non_exhaustive]pub enum ChatEventType {
Disconnect,
Event,
Message,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against ChatEventType
, it is important to ensure
your code is forward-compatible. That is, if a match arm handles a case for a
feature that is supported by the service but has not been represented as an enum
variant in a current version of SDK, your code should continue to work when you
upgrade SDK to a future version in which the enum does include a variant for that
feature.
Here is an example of how you can make a match expression forward-compatible:
# let chateventtype = unimplemented!();
match chateventtype {
ChatEventType::Disconnect => { /* ... */ },
ChatEventType::Event => { /* ... */ },
ChatEventType::Message => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when chateventtype
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant ChatEventType::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
ChatEventType::Unknown(UnknownVariantValue("NewFeature".to_owned()))
and calling as_str
on it yields "NewFeature"
.
This match expression is forward-compatible when executed with a newer
version of SDK where the variant ChatEventType::NewFeature
is defined.
Specifically, when chateventtype
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on ChatEventType::NewFeature
also yielding "NewFeature"
.
Explicitly matching on the Unknown
variant should
be avoided for two reasons:
- The inner data
UnknownVariantValue
is opaque, and no further information can be extracted. - It might inadvertently shadow other intended match arms.
Variants (Non-exhaustive)§
This enum is marked as non-exhaustive
Disconnect
Event
Message
Unknown(UnknownVariantValue)
Unknown
. See the docs on this enum for the correct way to handle unknown variants.Unknown
contains new variants that have been added since this code was generated.
Implementations§
source§impl ChatEventType
impl ChatEventType
source§impl ChatEventType
impl ChatEventType
sourcepub fn try_parse(value: &str) -> Result<Self, UnknownVariantError>
pub fn try_parse(value: &str) -> Result<Self, UnknownVariantError>
Parses the enum value while disallowing unknown variants.
Unknown variants will result in an error.
Trait Implementations§
source§impl AsRef<str> for ChatEventType
impl AsRef<str> for ChatEventType
source§impl Clone for ChatEventType
impl Clone for ChatEventType
source§fn clone(&self) -> ChatEventType
fn clone(&self) -> ChatEventType
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for ChatEventType
impl Debug for ChatEventType
source§impl From<&str> for ChatEventType
impl From<&str> for ChatEventType
source§impl FromStr for ChatEventType
impl FromStr for ChatEventType
source§impl Hash for ChatEventType
impl Hash for ChatEventType
source§impl Ord for ChatEventType
impl Ord for ChatEventType
source§fn cmp(&self, other: &ChatEventType) -> Ordering
fn cmp(&self, other: &ChatEventType) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
source§impl PartialEq for ChatEventType
impl PartialEq for ChatEventType
source§fn eq(&self, other: &ChatEventType) -> bool
fn eq(&self, other: &ChatEventType) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for ChatEventType
impl PartialOrd for ChatEventType
source§fn partial_cmp(&self, other: &ChatEventType) -> Option<Ordering>
fn partial_cmp(&self, other: &ChatEventType) -> Option<Ordering>
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read moreimpl Eq for ChatEventType
impl StructuralPartialEq for ChatEventType
Auto Trait Implementations§
impl RefUnwindSafe for ChatEventType
impl Send for ChatEventType
impl Sync for ChatEventType
impl Unpin for ChatEventType
impl UnwindSafe for ChatEventType
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
§impl<Q, K> Comparable<K> for Q
impl<Q, K> Comparable<K> for Q
§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.